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Understanding PET Acoustic Panels: Definition and Functionality
 
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Sound Absorption Coefficient (α): Definition, Formula & Measurement

Definition The sound absorption coefficient (α) is the ratio of sound energy absorbed by a surface to the sound energy incident on it, at a given frequency. It is the fundamental, frequency-dependent ...

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What Is Rw? Weighted Sound Reduction Index Explained

Definition Rw (Weighted Sound Reduction Index) is the single-number rating of a building element's airborne sound insulation — how well a wall, floor, ceiling, door or window reduces sound passing thr...

Aug 28, 2026 15 min read
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What Is RT60? Reverberation Time Explained

Definition RT60 (Reverberation Time) is the time, in seconds, that it takes for the sound pressure level in a room to decay by 60dB after the sound source is switched off. The "60" refers to the 60dB ...

Aug 28, 2026 14 min read
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What Is NRC? Noise Reduction Coefficient Explained

Definition NRC (Noise Reduction Coefficient) is a single-number rating (0.00 to 1.00) that represents how much sound a material absorbs , calculated as the arithmetic average of its sound absorption c...

Aug 28, 2026 12 min read
What Is STC? Sound Transmission Class Explained

What Is STC? Sound Transmission Class Explained

Definition STC (Sound Transmission Class) is a single-number rating of the airborne sound insulation of a building partition or element — a wall, floor, ceiling, door or window. A higher STC means the...

Aug 26, 2026 15 min read